iPhone 8 image is reportedly leaked, the image is quite blurred so you cannot say for sure how the iPhone 8 will look like,
as most of the recent leaks suggest, the iPhone 8 will have all glass screen on the front, but the fingerprint scanner will move to the back of the phone which will make it more spacious from the front providing extended display screen for users.
The image indicates that the fingerprint screen is at the back just below the Apple logo, to some extent it was a good decision to move the scanner to rear because when you pick up the phone your finder remains at the same location where it is placed for holding the phone firm.
GSM arena picked the leaked image from Chinese source makes it less reliable, however, it could be a Chinese copy of another iPhone. But the environment seems to be produced where an employee could take the image and share it on the internet.
Apple, on the other hand, has not yet disclosed iPhone’s 8 launch date which is expected by the end of the month or little later.